Pipeline repair workers need training before they can start working: the professional foundation of safety and skills In the modern industrial production and urban operation systems, pipelines are like the blood vessels of the human body, undertaking the task of transporting important media such as energy, water, and chemical materials. Whether it is the high-temperature and high-pressure pipelines in petrochemical plants or the gas and water supply networks underground in cities, once they leak or are damaged, not only will it cause waste of resources and production disruption, but it may also lead to serious safety accidents such as fires, explosions, and environmental pollution. In the face of sudden pipeline emergencies, repair workers need to rush to the scene within the shortest time and complete a series of operations such as sealing and repair in a complex and dangerous environment. However, pipeline repair is not a simple job that can be accomplished merely by physical strength or experience; it is a technical work that requires extremely high levels of professional knowledge, operational skills, safety awareness, and emergency response capabilities. Pipeline repair workers must undergo systematic and rigorous training before they can start working, which not only ensures the safety of the workers themselves but also is responsible for social public safety and the stability of enterprise production. This article will deeply elaborate on the necessity of pipeline repair worker training, the training content system, and the comprehensive value brought by the training from multiple dimensions. First, the high risk involved in pipeline repair operations necessitates the need for training. The uniqueness of pipeline emergency repair operations is primarily reflected in their high risk. Unlike regular pipeline installation operations, emergency repair operations are often carried out under abnormal conditions - the pipeline may still contain pressure, the medium may have flammable, explosive, or toxic and harmful properties, the working environment may be in a narrow trench or at a high-altitude position, and the repair time is extremely urgent and cannot be delayed at all. The combination of these factors makes pipeline emergency repair a typical example of high-risk operations. The risk of the medium is the primary threat faced during emergency repairs. The media transported in the pipelines are diverse, including crude oil, refined oil, natural gas, etc. Once these flammable and explosive media leak, they can cause fires and explosions upon encountering open flames or static electricity; toxic media such as chlorine, ammonia, and hydrogen sulfide can cause acute poisoning and even death to humans; high-temperature steam and hot oil can cause severe burns; corrosive media such as acids and alkalis can burn the skin and eyes. Untrained workers lack awareness of the dangers of these media and may take incorrect operations during the emergency repair process, resulting in disastrous consequences. The risk of pressure also cannot be ignored. The inside of operating pipelines often maintains a certain pressure. Even for low-pressure pipelines, the kinetic energy of the medium ejected is sufficient to cause injury. At the leakage points of high-pressure pipelines, the jet speed of the medium is extremely high, which can cause cutting injuries to personnel. Pressure-controlling emergency repair operations need to be carried out under pressure conditions for blocking and welding, which has extremely high requirements for the operation skills of workers. Untrained personnel cannot accurately determine the pressure level and select the appropriate blocking method, and are very likely to have medium ejection accidents during the operation process. Environmental risks further increase the complexity of emergency repair operations. The site of pipeline leakage is often complex in terrain - deep trenches several meters deep have the risk of collapse; there is insufficient lighting for night repairs; roads are slippery in rainy or snowy weather; urban road repairs need to deal with passing vehicles; there are also cross-workings and other hazards within the chemical plant area. Trained workers can correctly identify environmental risks and take necessary protective measures, while untrained personnel may ignore these risks. Time pressure is a unique psychological challenge in emergency repair operations. Pipeline leaks often lead to production disruptions, user gas and water outages, and environmental pollution spread. Emergency repair work is time-critical. Under tight time constraints, workers are prone to become impatient, negligent, and engage in improper operations. Only workers who have undergone strict training and possess good psychological qualities can remain calm under pressure and operate in accordance with standard procedures. II. Core Content System for Pipeline Repair Workers' Training The training of pipeline repair workers is a systematic project, covering various modules such as theoretical knowledge, operational skills, safety regulations, and emergency response. A complete training system usually includes the following core contents: Safety knowledge and risk identification training is the fundamental module of the training system. This part aims to help workers establish correct safety awareness and master the basic methods of hazard identification and risk control. The training content includes: the physical and chemical properties of various media and their hazardous characteristics, the identification and assessment of pipeline pressure grades, methods for identifying hazard sources at the work site, the correct selection and wearing of personal protective equipment, the usage methods of fire-fighting equipment, first aid and self-rescue skills, etc. Through this module of learning, workers can conduct a comprehensive risk assessment before entering the repair site and maintain a high level of safety vigilance during the operation. The training on pipeline basic theory and drawing interpretation lays the theoretical foundation for subsequent technical operations. Workers need to master the basic composition of the pipeline system, understand the characteristics and applicable conditions of different materials (carbon steel, alloy steel, stainless steel, cast iron, PE, etc.) of the pipelines; be able to read technical documents such as pipeline construction drawings, process flow diagrams, and single-line diagrams; understand the basic principles of pipeline stress, thermal expansion, support and fixation; be familiar with the structures and functions of various valves, flanges, and pipe fittings. These theoretical knowledge helps workers accurately assess the overall condition of the pipeline system and formulate reasonable emergency repair plans. Repair technology and operation skills training is the core part of the training system. Depending on the different types of repair operations, this module covers a variety of specialized techniques: Pressure-sealing leak repair technology is one of the most commonly used techniques in pipeline emergency repairs. The training content includes the structure and usage of various sealing fixtures, the process principle of glue injection leak sealing, the sealing strategies for different types of leakage points, and the safety precautions for leak sealing operations. Workers need to practice repeatedly to master the ability to quickly implement sealing under different pressures and different media conditions. Pressure-bearing hole opening and sealing technology training is designed for scenarios where pipeline renovations or emergency repairs need to be carried out without interrupting the flow. Workers need to learn about the structural principles of pressure-bearing hole opening equipment, the installation and operation of clamp valves, the selection and maintenance of hole opening tools, the parameter control during the cutting process, and the installation and removal of sealing heads. This technology has extremely high requirements for operational accuracy and can only be mastered through a large number of simulation training sessions. Pipeline welding technology training is an important part of emergency repair for metal pipelines. Unlike conventional welding, emergency welding often needs to be carried out under conditions such as high pressure, water flow, or limited space.